Helical solar tube



FIG. 1 is a perspective view of the helical solar tube;

FIG. 2 is an end view thereof;

FIG. 3 is the opposite end view thereof;

FIG. 4 is a side view thereof; and,

FIG. 5 is an exploded view thereof. 

CLAIM The ornamental design for a helical solar tube, as shown and described. 